Abstract：The integration of large-scale wind power，photovoltaic and other renewable energy resources for

the power system will greatly change the power supply characteristics，reducing the inertia of power system and

threatening the stability of transient frequency. The virtual synchronous generator（VSG）technology can improve

the inertia of renewable energy to promote the stability of transient frequency. In order to quantitatively describe the

characteristics of transient frequency of VSG and enhance the control ability of VSG，the transient frequency model

of VSG needs to be studied urgently. Based on the VSG control strategy of renewable energy，considering the

inertial response，primary frequency regulation of renewable energy，the transient frequency model of VSG was

established，and a Matlab/Simulink based simulation model was built to verify the validity of the established

analytical model. Finally，the influence of different control parameters on the transient frequency of VSG was

analyzed，and the effect of control parameters on the transient frequency of VSG was clarified，giving the guidance

for system frequency stabilization.

     Key words：virtual synchronous generator（VSG）；inertial response；primary frequency regulation；transient

frequency